Question

An aqueous solution containing a substance whose concentration is 7.50 g/L has an osmotic pressure of...

An aqueous solution containing a substance whose concentration is 7.50 g/L has an osmotic pressure of 1150 Torr at 77 K.

(a) What is the molecular weight of the solute?

(b) What is the osmotic pressure of a solution at 27 degrees C that contains 1.00 g of this solute in 500 mL of solution?

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Homework Answers

Answer #1

PV = nRT

P = 1150torr = 1150/760 = 1.513atm

W   = 7.5g

V    = 1L

T   = 77K

PV = WRT/M

M   = WRT/PV

    = 7.5*0.0821*77/1.513*1   = 31.34g/mole

b. PV = nRT

PV   = WRT/M

W    = 1g

M   = 31.34g/mole

T    = 27C = 27+273 = 300K

V   = 500ml = 0.5L

PV   = WRT/M

P   = WRT/VM

     = 1*0.0821*300/0.5*31.34   = 1.57atm

  

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